Since reddit is great and everything I thought it might be cool to try to make this a community effort. Having some sort of ready compiled list with a nice description of each engine would definitely help a lot.

If you don't have anything better to do and want to help fellow redditors interested in JS game dev out, feel free to fork the list and modify it as you like. :)

Yeah, of course, you're right. I'd say Github is usually the place where projects aggregate related libs (ex: the node wiki). Of course, not being a project, that doesn't really help us, but I do agree with what some others have said that Github may be the best place.

I'm not totally sure where it would fit in your list, but I think it's important to note processing.js, a port of the Processing language to javascript. It has many features that could definitely be of use to the sort of people who need a list like this.

I'll add the 3D libraries GLGE and SpiderGL. I've tried both of them, liked them both. Spider's documentation is a little weak, but can produce some great results. GLGE is (fairly) actively developed, so the API's change sometimes, but it's also a really nice library.